Fate of itertools.dropwhile() and itertools.takewhile()

[bearophileHUGS at lycos.com]

Almost every day I write code that uses itertools, so I find it very
useful, and its functions fast.
Removing useless things and keeping things tidy is often positive. But
I can't tell you what to remove. Here are my usages (every sub-list is
sorted by inverted frequency usage):

I use often or very often:
groupby( iterable[, key])
imap( function, *iterables)
izip( *iterables)
ifilter( predicate, iterable)
islice( iterable, [start,] stop [, step])

I use once in while:
cycle( iterable)
chain( *iterables)
count( [n])
repeat( object[, times])

I have used probably one time or few times:
starmap( function, iterable)
tee( iterable[, n=2])
ifilterfalse( predicate, iterable)

Never used so far:
dropwhile( predicate, iterable)
takewhile( predicate, iterable)

Bye,
bearophile